Solar wind control of the low-latitude asymmetric magnetic disturbance field

Details Solar wind control of the low-latitude asymmetric magnetic disturbance field Solar wind control of the low-latitude asymmetric magnetic disturbance field

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.2123c&link_type=abstract

Journal of Geophysical Research, vol. 88, Mar. 1, 1983, p. 2123-2130.

Physics

51

Auroral Zones, Geomagnetism, Ionospheric Currents, Magnetic Disturbances, Solar Terrestrial Interactions, Space Plasmas, Electron Energy, Linear Filters, Lines Of Force, Mathematical Models, Partial Differential Equations, Solar Wind

Scientific paper

The extent to which the low latitude dawn-dusk magnetic asymmetry is controlled by the dawn-dusk solar wind motional electric field VBs and/or substorm processes measured by the westward auroral electrojet index AL is studied using the technique of empirical linear prediction filters. A new index, (ASYM), defined as the difference between dawn and dusk deviations in the X (geomagnetic Northward) magnetic field component, is used to measure the dawn-dusk asymmetry. Quantitative information which characterizes the coupling processes are provided by the empirically determined filters obtained from this analysis. Results indicate that some currents are directly driven by the solar wind-magnetosphere interaction and that their magnetic perturbations contribute to both the AL and ASYM indices. However, a portion of the AL index that is uncorrelated with VBs is correlated with ASYM which suggests that internal magnetospheric processes also contribute to AL and ASYM.

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